You should not hesitate to contact lawyers in your area for help with this one. While you may not be able to pay up front legal fees, you may find an attorney who will work for a contingency fee. You can contact the local bar associations for referrals of lawyers who practice in the field, and who may be willing to accomodate you.
As for the actual costs of a suit, the Clerk's office of your circuit court publishes the filing fee schedule. You will also have to pay for any costs of discovery, such as court reporters, transcripts, copying fees, etc. Have you also considered contacting the authorities to consider Cyberbullying charges, stalking, etc.?
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